the new OSK may be like the OSK on the PS3
So they skipped a sleuth of 4.xx versions this time.
For those that don't have a PS3, the OSK redevelopment will be interesting to see. Sleep for music may be useful if you do that kinda stuff, though I've tried and I find the headphone cords get tangled (might work better with wireless).
wondering how to get use 5.0 wave on 4.0x
PSP official firmware 5.01 out now, Firmware 5.01 fixes an issue where PSP owners using 8GB or 16GB Memory Stick PRO Duos get a message saying there is insufficient memory space on their Memory Sticks while downloading stuff from the PlayStation Store even when there is enough space.